Locking-latch



(.Model.)

PA R, LOCKING LATCH. No. 276 623. Patented Ma 1,1883.

N PETERS, Photoiilhognphv. Washin ton, D. C.

UNITED STATES PATENT OFFICE.

FREDERICK PALMER, OF HAMPTON, VIRGINIA.

LOCKING-LATCH.

SFEGIFIGATION forming part of Letters Patent No. 276,623, dated May 1, 1883.

Application filed July 10, 1882. (ModeL) To all whom it may concern Be it known that I, FREDERICK PALMER, a citizen of the United States of America, residing at Hampton, in the'county of Elizabeth City and State of Virginia, have invented certain new and useful Improvements in Door- Locks,of which the followin g is a specification,

reference being had therein to the accompanying drawings. i i Y My invention relates'to door-latches; and it consists in the combination of parts which will be hereinafter described, and pointed out in Similarletters referto similar parts throng-h out the several'views.

A represents the front face-plate, and A the main key-hole therein. i A is a standard or'guide for the latch-key. A is a slot in the front end casing,in which the bolt works.

A A are screw-holes, by means of which the lock is secured to the door.

A is the top casing, A the bottom casing,

and A A the rear and front ends, respectively.

A A are posts riveted to casing A, and aiding to support the top and bottom casing.

B represents the bolt proper.

B is a narrow strip riveted to the inner side of the bolt. The key straddles this strip in moving the bolt forward to the position indicated by dotted bolt lines in Fig. 1, and also in returning the bolt from the dotted lines to its normal position, as shown in the full lines in said figure. V

B is an ear on the end of the bar, which is rigidly secured to the rear inner side of the bolt. 13 is also an ear formed on the bolt.

13* indicates the rear end of the bolt; B a slot therein.

13 is alongitudinal slot through the body of the bolt.

B B are two slots formed in top of the bolt.

0 represents theinsideknob, and C the out- 3 side.

D is a bar uniting the knobs, and D the shoulder on said bar. This shoulder fits in the slot B of the bolt.

E is an arm formed on shoulder D. By turning back the knob the bar D and shoulder D are revolved backward, and the arm E thereby raised upward and backward, causing the same to engage the ear B (shown in dotted lines, Fig. 1) and force the bolt back and disengage the same from its keeper. The spring hereinafter described will force the bolt forward after the hand is released fromthie knob.

F is a bar immediately abovethe bolt. It

is provided with a ring, F, on its rear end,

which encircles a post, F.

F is a catch on the forward end of the bar. This catch, when the bolt is unlocked, restsin the forward slot, B permitting the bar to move back and forth to the extent of the length of said slot. When the bolt is turned forward back slot, B in which position it must remain until released by raising the foot F, which is rigidly formed on the bottom of the bar F. (Shown in Fig. 5 and in dotted lines of Fig.1.)

G indicates the dead-latch, and G a vertical slot therein that works on the post G Gr isa spiralspring encircling the post.. The forward end of this spring rests against the dead-latch G,and the rear end thereof rests against the back plate. By the aid of this spring the dead-latch will remain in any position placed. g

G is a thumb-knob on the face-plate A. is fixed to the end of post G G isa slot (shown in dotted lines,Fig. 1) in plate A.

G7 represents the right-angled projection of the dead-latch, and G the slot in said latch for the reception of the latch-key. The strong lines, Fig. 1, represent the latch resting on the IOO engaged the latch can be lowered by either one of two ways. A person on theinside can disengage the same by pressing down on the thumb-knob G, or a person on the outside provided with a latch-key can also disengage the latch by inserting his key, thereby forcing the projection G7 below the ear B The bolt can then be moved by the knob.

The remaining letters on the drawings indicate the following parts:

H is a longitudinal rib fixed to the back of face-plate A. The slot B in the rear end of the bolt straddles this rib, and is adapted to slide thereon.

I is the arm ofa coiled spring, fixed to a post, I. I is the arm of another coiled spring, which is fixed to a post, 1 The posts I l are fixed to the inside of the face-plate A.

J represents the back plate.

-K is the shank of the main key, and K K the bits thereof. This main key, which works from the inside, can move the bolt irrespective of the position of the latch-thatis to say, it the projection G of the latch be engaged with the ear B of the bolt, such engagement only prevents the arms of lug E from forcing back the lug B on the bolt through the medium of the knobs, bar, and shoulders. The function of the main key is to throw the bolt forward to the position indicated by dotted lines. Such position would move the shoulder oflug 1? forward of the arm E, so that said arm couldobtain no purchase on said shoulder should an attempt be made to raise the same by the knob-that is to say, when the bolt is locked (thrown forward by the key to the dotted lines) the arm E would be powerless to operate on said bolt, by reason of the fact that the smooth under side of the lug B would rest immediately over the top engaging projection of the arm. It must therefore be apparent that the arm E can only engage and act upon the shoulder B when the bolt is in its normal position indicated by the full lines in Fig. 1.

The operation of locking the bolt and securing it in the dotted position is as follows: Place the key in the hole A and move the same forward. The lug K ot'the key will raise the foot F of the bar F. This action will raise and disengage the catch F from the slot B. The lug K of the keywill at the same time engage the sides of the slot B of the bolt and force said bolt forward. The key-lugs, after having completed their half-revolution, will be turned downward, and thus permit the foot I to be lowered to its normal position, as shown in dotted lines. suflicient length to force the bolt forward, so that catch F will engage the slot 13 of the bolt after the key has completed its revolution. The arm I of the spring will force the catch E into slot 13 when the bolt is thrown forward by the key. When the bolt is thus lockedit will be seen that by revolving the key backward in the lock the foot F and catch F will be forced up and the bolt thrown back and the catch l again placedin slot B thereby leaving the bar D and arm E in a position to engage and move shoulder B on the bolt by turning the knobs O O. The arm I of the back spring rests against the rear end of the bolt and presses the same forward alter the same has been forced back by the knobs and its connecting means.

It must be apparent from the foregoing that this look answers the three following purposes a day-latch, a night-lock, and a dead-latch.

Havingthusdescribed inyinvention and set forth its advantages, I claim as new and desire to secure by Letters Patent-- The dead-latch G, having projection G adapted to engage and secure the lug B on bolt B, said latch being provided wit-h slots G G and held in position by spring G3 on post G the thumb-knob G and post G the latter adapted to work in slot G6 of plate A, substantially as described and specified.

In testimony whereof I affix. my signature in presence of two witnesses.

FREDERICK PALMER.

. Witnesses:

J NO BOOKER, H. R. BOOKER.

The key-lugs are of 

